We can maintain the carbon cycle by
Answer:
The boat moves backward when the person jumps out of the boat is due to the reaction force of the person on the boat in the backward direction.
Explanation:
Explanation: The direction of the reaction force acting on a body due to the action of a force in a particular direction is given by the Newton's law.
Answer:
Explanation:
Make an observation.
Ask a question.
Form a hypothesis, or testable explanation.
Make a prediction based on the hypothesis.
Test the prediction.
Iterate: use the results to make new hypotheses or predictions.
Answer:
Answer is C.
Explanation:
A. The vessel length is pretty much constant. The body can't length or shorten blood vessels.
B. Blood viscosity is also fairly constant because the composition of blood cannot change quickly enough to change resistance as needed.
C. This is the main way resistance is controlled. The smooth muscle surrounding blood vessels can rapidly respond to hormonal or metabolic stimuli and contract/relax to adjust diameter.
D. Again, temperature is fairly constant in the body and would not be a good way to alter resistance.
